Hello, my idea for an SCP is a constellation based entity that would change with the Zodiacs resulting in different forms and whatnot (Gemini would make two human like entities that are telepathic to each other, Taurus would make it a bull with extreme strength, etc). However I'm not sure how to go with this SCP if it is a good idea. If I do one SCP, it would be a huge article with descriptions of 12 different forms. If I do it as 12 separate SCPs (each is a separate entity but they all relate to each other) I feel like it would be too similar to the Wondertainment Mr. series.

The problem here is that its too obvious and played straight. An entity that mimics the zodiac is ultimately one note and boring, because you're just rehashing existing info in an existing manner. There are plenty of ways you could make an interesting zodiac based skip, but just avatars of the constellations won't cut it.

The only way something similar to this could work off the top of my head would be if you tried a subversion narrative where you introduced one or more zodiac sequences that are different from what would be expected, with an underlying implication that the popular zodiac is incorrect or elements of it are being covered up. Bonus points if you incorporate the irl Ophiucus kerfuffle.